Modelling the response of phytoplankton in a shallow lake (Loch Leven, UK) to changes in lake retention time and water temperature

The Des Moines River lost 65–75% of its algal standing crop (chlorophyll a) in passing through each of two impoundments (mean retention times 11 and 16 d), and chlorophyll concentrations within both impoundments were 50–90% below the predictions of empirical chlorophyll–nutrient models. Sedimentation of river-borne algae and light limitation within the impoundments were identified as major loss processes. A reduction in algal size from upstream to downstream in one reservoir paralleled the loss of algal biomass. Algal losses in each impoundment increased with both increasing retention time and water temperature so that chlorophyll concentration below the dams was uncoupled from the temperature and flow dependence seen in river reaches not influenced by impoundments. The reduction in riverine algal transport associated with reservoir transit was cumulative over the two-reservoir series; this reduction can be interpreted as a "reset" to river headwater conditions.

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The sensitivity of phytoplankton in Loch Leven (U.K.) to changes in nutrient load and water temperature

Freshwater Biology ◽

10.1111/j.1365-2427.2007.01865.x ◽

2007 ◽

Vol 0 (0) ◽

pp. 070824035525002-??? ◽

Cited By ~ 2

Author(s):

J. ALEX ELLIOTT ◽

LINDA MAY

Keyword(s):

Water Temperature ◽

Nutrient Load ◽

Loch Leven

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Rotifer occurrence in relation to water temperature in Loch Leven, Scotland

Biology of Rotifers ◽

10.1007/978-94-009-7287-2_39 ◽

1983 ◽

pp. 311-315 ◽

Cited By ~ 4

Author(s):

Linda May

Keyword(s):

Water Temperature ◽

Loch Leven

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Domestic Sewage Treatment Using an Anaerobic Biofilter with an Aerobic Biofilter

Water Science & Technology ◽

10.2166/wst.1986.0292 ◽

1986 ◽

Vol 18 (7-8) ◽

pp. 209-216 ◽

Cited By ~ 8

Author(s):

Y. Inamori ◽

R. Sudo ◽

T. Goda

Keyword(s):

Water Temperature ◽

Retention Time ◽

Hydraulic Retention Time ◽

Sewage Treatment ◽

Domestic Sewage ◽

Circulation Ratio ◽

Low Strength ◽

Bod Removal ◽

Organic Wastewater

The purpose of this study was to assess the applicability of the anaerobic biofilter process to treat low strength organic wastewater such as domestic sewage. It was found that when the influent BOD was approximately 200 mg/l, water temperature and BOD loading, under a hydraulic retention time (HRT) of 30 hrs, were 20°C and 0.2 kg/m3.day respectively, a BOD removal of at least 70% was attained, and the ratio of sludge produced to BOD removed in the anaerobic biofilter was as low as 0.1. Furthermore it was also found that 75% of nitrogen (N) could be removed in the anaerobic-aerobic biofilter process when the circulation ratio was more than 1:2.

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Effect of climate change on thermal-ice regime of shallow lakes compared to deep lakes: Case study of lakes in the temperate zone (Northern Poland)

Journal of Limnology ◽

10.4081/jlimnol.2018.1763 ◽

2018 ◽

Vol 78 (1) ◽

Cited By ~ 1

Author(s):

Włodzimierz Marszelewski ◽

Bożena Pius

Keyword(s):

Water Temperature ◽

Surface Waters ◽

Shallow Lakes ◽

Thermal Regime ◽

Shallow Lake ◽

Deep Lakes ◽

Deep Lake ◽

Ice Regime ◽

Ice Phenomena

The objective of this study is to determine the usefulness of results of hydrological observations (1961-2015) carried out in a deep lake for the assessment changes in the ice-thermal regime of a shallow lake. The paper is based on results of daily values of surface water temperature and ice phenomena in shallow Lake Łebsko and deep Lake Charzykowskie. Similar, statistically significant, positive trends of water temperature were determined in both lakes (0.26°C 10 year-1 in Lake Łebsko and 0.25°C 10 year-1 in Lake Charzykowskie). The fastest increase in mean monthly water temperature in the analysed period (1961-2015) occurred in May (3.37°C in Lake Charzykowskie) and April (2.76°C in Lake Łebsko). The majority of elements of the thermal regime of surface waters in shallow lakes were generally determined to be similar to the same elements in deep lakes, and the effect of climatic changes on the thermal regime of both lakes was found to be similar. Less similarity is observed between elements of the ice regime, particularly in date of decline of the ice cover.

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